Diagnosing Mechanical Looseness

Mechanical looseness is a condition that occurs when there is excessive movement or play in mechanical components. It can cause a wide range of problems, including decreased efficiency, increased wear and tear, and even catastrophic failure. Mechanical looseness can be classified into two broad categories: rotating looseness and structural looseness. In this article, we will discuss these two types of mechanical looseness and their characteristics. 

Rotating looseness occurs in rotating machinery such as pumps, fans, and motors. It is caused by excessive play or movement in the rotating components, such as shafts, couplings, and bearings. Rotating looseness can be challenging to diagnose because it often occurs only when the machine is running. Symptoms of rotating looseness can include vibration, unusual noises, and increased temperature. 

Rotating looseness can be caused by excessive clearance between rotating parts and stationary parts of the machine (bearing wear). To diagnose rotating looseness, time wave form is a very useful tool, and phase measurement should be avoided.

Diagnosis: 1X Harmonics / 0.5X Harmonics in severe cases

Structural looseness happens when the structure is not bolted down well. In this scenario, phase measurement is a useful tool. 

Diagnosis: 1X Strong in horizontal direction
1X horizontal >> 1X vertical

Both types of mechanical looseness can cause a wide range of problems, but with proper diagnosis and corrective measures, the problem can be resolved, ensuring the reliable and efficient operation of the machine.

This post was written in conjunction with our friends at Machinery Diagnostics Institute